WORM_JENXCUS.OID
Worm:Win32/Jenxcus.D (Microsoft); [.au3]:PWS-ZBot.gen.auh (McAfee); Trojan.Zbot (Symantec); Trojan-Spy.Win32.Zbot.oqwf (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Generic9_c.TCQ (AVG)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
833,548 bytes
EXE
Yes
01 May 2014
Arrival Details
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This worm drops the following copies of itself into the affected system:
- %User Temp%\svshost.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
svshost.exe = "%User Temp%\svshost.exe "
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
svshost.exe = "%User Temp%\svshost.exe "
Other System Modifications
This worm adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Temp%\svshost.exe = "%User Temp%\svshost.exe:*:Enabled:svshost.exe"
Dropping Routine
This worm drops the following files:
- %User Temp%\aut1.tmp
- %User Temp%\ranzufz
- %User Temp%\aut7.tmp
- %User Temp%\ufnkbgv
- %User Startup%\svshost.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
Other Details
This worm connects to the following possibly malicious URL:
- {BLOCKED}0
This report is generated via an automated analysis system.
SOLUTION
9.300
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- svshost.exe = "%User Temp%\svshost.exe "
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- svshost.exe = "%User Temp%\svshost.exe "
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %User Temp%\svshost.exe = "%User Temp%\svshost.exe:*:Enabled:svshost.exe"
Step 4
Search and delete these components
- %User Temp%\aut1.tmp
- %User Temp%\ranzufz
- %User Temp%\aut7.tmp
- %User Temp%\ufnkbgv
- %User Startup%\svshost.exe
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_JENXCUS.OID. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Did this description help? Tell us how we did.